29. 4 Maternal gene products esta blish gradients in early embryogenesis Follicle cells Oocyte Q 何g9 W urse cell CytoplasmIc bndge Figure 29. 3 A Drosophila follicle contains an outer surface of follicle cells that surround nurse cells that are in close contact with the oocyte. Nurse cells are connected by cytoplasmic bridges to each other and to the anterior end of the oocyte Follicle cells are somatic: nurse cells and the oocyte are germline in origin 请莘大Figure 29.3 A Drosophila follicle contains an outer surface of follicle cells that surround nurse cells that are in close contact with the oocyte. Nurse cells are connected by cytoplasmic bridges to each other and to the anterior end of the oocyte. Follicle cells are somatic; nurse cells and the oocyte are germline in origin. 29.4 Maternal gene products establish gradients in early embryogenesis